15 



Feot InchM. 

 . Band composed of shaly Marl, with thin veins of fihrooB 

 Carbonate of Lime, and a thin hard band, contains t' 



ArchsBoniscus, Vejfetable Remains, and Shells 8 



Blue coiiiininuted Shell Limestone 11 



Band of slialy Marl „ „„ o i 



Compact Shell Limestone /. I S 



Bed of shells, with Melani^ Chflina J o 



Grey compact Shell Limestone, with Ostrea Diiitorta ... 1 I 



Do u G 



The remaining beds which present themselves successively from be- 

 neath the beach down to the Cinder (which rises at a considerable angle) 

 are in their proper order. The* beds composing the Downs vein being 

 thus repeated three times. 



Here is the centre of the bay, and hence to its western extremity the 

 series of beds, from the cinder downwards, is repeated, but in many places 

 they are hidden by the debris of the fallen clitf. 



At Durdlestone Head the Portland oolite commences, the Purbeck 

 beds rise to the top of the cliff which they cap, to within about a mile of 

 St. Alban's Head, the valleys of Seacomb and Winspit being oolite. 

 Thence their boundary line turns away to Kingston. The cinder is ex- 

 posed on the top of Kingston Hill. 



Near Browndown a descent may be effected to the edge of the cliff, 

 whence may be obtained good weathered slabs of the cypris limestone, 

 and from the chert bands which are exposed only at this spot. Returning 

 to Durdlestone Head, the cliff is composed of Portland oolite, called by 

 the quarriers Purbeck Portland stone. At Tilly Whim is an oyster bed 

 from seven to eight feet thick, and a Trigonia bed from six to seven feet 

 thick. The Dancing Ledge quarry presents the following section. The 

 names applied to the beds are those made use of by the quarriers. 



Red Head. 



Slirimp, containinjy a large Cardium. Natica, Trigonea clavalata, Trochus, &c. 



Blue Bed, Ammonites, Ostrea, and a large and a small Pecten. 



Spangle cap. Trigonea clavalata. 



"NVhite Cap. 



Pond Freestone. 



Flint. 



Lister Bed. 



House Cap. 



Under picking Cap. 



Under Freestone, Ostrea gigantea. 



Under Rock. Ammonites. 



With regard to the dirt bed which is so conspicuous at Lulworth, I am 

 not prepared to state whether it exists to the east of Kimmeridge. I 

 have, however, obtained good specimens of fossil wood from walls in the 

 neighbourhood of Afflngton Barn, which must have been collected from 

 no great distance. On the east side of the valleys of Bottom and 

 Encombe, and overlying the shale works at Kimmeridge is an oolitic 

 gravel. From this bed, at a pit opened near Encombe House in 1849, 

 were obtained bones of the Elephant and fossil Ox. 



Between Winspit and St. Alban's Head the Portland sand commences. 

 It contains a few anunonites and shells, but is not very fossiliferous at 

 this locality. 



'I'he Kimmeridge clay rises from beneath this bed at St. Alban's Head. 

 Its characteristic fossils arr thr Ostrea deltoidea, ammonites triplex, 



